I have had my Optimus V for two years now. It has always worked fine till recently. My memory was very low so I cleaned all the data and caches. Then I got rid of a few memory hungry apps. Now, the LG Optimus V just shuts itself off intermittently! I have to do a battery pull every time! The screen remains lit but the display won't show up.! What have I done? If there is an answer, please HELP me!!!